Mini DisplayPort to DVI not working, No Multi-Monitor, Jerky Mouse

I have an iMac, 27 inch, 2009 model.
Until today I've had a second monitor attached via the Mini DisplayPort to DVI adapter. The monitor is a Samsung SyncMaster T260. This setup has worked perfectly well so far.
Until today that is. Now the monitor is not recognised any more and if I try to select "Detect Displays" the mouse pointer hangs every few seconds - stops dead and then restarts again.
What did I do to make this happen? Nothing (that i'm aware of). Haven't installed anything, not done a software update, just literally rebooted and it's not working anymore.
_*Things that still work...*_
The Mini DisplayPort to DVI adapter works on a Mac Mini, so that's OK
The DVI cable works fine when plugged into a PC or Mac Mini, so that's OK
The Monitor works fine when plugged into a PC or Mac Mini, via DVI, HDMI or VGA, so that's OK
So I've established that, in isolation, each part of the system is functioning perfectly well.
*_Things I have tried - without success..._*
1) Rebooting - both iMac and monitor
2) Unplugging all cables and reconnecting then rebooting again
3) Clearing the PRAM - done it twice just to make sure
4) Updated to OS X 10.6.7
5) Reset the SMC
6) Deleted the com.apple.windowserver.plist files at /Library and ~/Library
7) Googled for solutions - plenty of people seem to have one or the other of these symptoms...
Can anyone shed any light on what's happened here ? Please help!
Cheers
Mart
** Sorry if this is in the wrong place, I just found a forum specifically for the iMac so posted it there but not sure how to delete this one. **

Well, it would be interesting if that's when it had occurred. At the time, I hadn't installed 10.6.7, and hadn't installed anything immediately prior to the problem occurring.
It doesn't seem like there's any way (a-la System Files Checker on Windows) of checking the integrity of system files which may have been corrupted, nor a way of reinstalling any update in the case of this happening - or is there a way of doing this? You don't seem to have any control over updates apart from applying them - if something does go wrong, there's no way of backing out. I guess Time Machine is the answer to my own question there.
I'm happy that it's working now, but it was a pretty extreme fix to have to wipe the entire system. At least it wasn't a hardware issue, I'll be thankful for that!

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Hello Everyone,
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Well, it would be interesting if that's when it had occurred. At the time, I hadn't installed 10.6.7, and hadn't installed anything immediately prior to the problem occurring.
It doesn't seem like there's any way (a-la System Files Checker on Windows) of checking the integrity of system files which may have been corrupted, nor a way of reinstalling any update in the case of this happening - or is there a way of doing this? You don't seem to have any control over updates apart from applying them - if something does go wrong, there's no way of backing out. I guess Time Machine is the answer to my own question there.
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Solley wrote:
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srikat,
Welcome to the Apple Discussions. You will have better help from people who read the questions in the laptop section. Check this location and see if you get a better response.
Check Here
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6/1/10 9:45 AM 27-inch iMac EFI Firmware Update 1.0
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6/4/10 11:47 AM 27-inch iMac SMC Firmware Update 1.0
6/4/10 11:47 AM 27-inch iMac Display Update 1.0
6/5/10 7:29 AM 27-inch iMac Display Update 1.0
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Chipset Model: ATI Radeon HD 4850
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: ATI (0x1002)
Device ID: 0x944a
Revision ID: 0x0000
ROM Revision: 113-B9110C-425
EFI Driver Version: 01.00.383
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27-inch iMac Display Firmware Update 1.0
http://support.apple.com/kb/DL998
27-inch iMac Graphics Firmware Update 1.0
http://support.apple.com/kb/DL984
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